The substituted imine is called the Schiff base, which, structurally, is a nitrogen analog of an aldehyde or ketone, in which the carbonyl group (C=O) is replaced by an imine group (C=N), a carbon-nitrogen double bond. Schiff base synthesis is a reversible reaction in which dialdehydes and aminobenzoic acids can be used as reactants. The efficacy of these reactions is controlled by two main factors that have a large impact on yield. The acid concentration shouldn't be to high ( pH between 4 and 5), slightly acidic conditions are required in which water loss occurs, opposite of that, if the solution is too acidic, the amine is protonated, which inhibits the first stage – the reaction cannot continue. Dialdehydes are organic compounds formed by intermolecular condensation reactions and polymerization reactions. They contain two aldehyde groups and in the reactions with aminobenzoic acids they form a double C=N bond with both groups. Dialdehydes can be synthesized form aldehydes and long-chain halogenalkanes under certain reactions conditions ( high temperature with ethanol as solvent). Aminobenzoic acids are organic compounds at which the amino group- \( NH_{2}\) is attached to the benzene ring of benzoic acid at three different sites. There are Three isomers of aminobenzoic acids, namely orto-aminobenzoic acid, meta-aminobenzoic acid and para-aminobenzoic acid. The use of acidic medium, deprotonates the nitrogen of the amino group of these isomers, and they reacts with the carbonyl group of the dialdehyde to form am inmino double C=N bond. IR spectroscopy provides us withs information on vibrational connections, which provest he presence of functional groups. Iti s based on the absorption of light by infrared radiation, which measures the amount of radiation absorbed by a compound as a function of wavelength. An infrared spectrometer based on the Fourire transform (FT-IR) is used by important information. The spectrum of Schiff bases shows vibrations of the C=N bond ( imino group) in the range 1680 – 1600 \(cm^{-1} \). The spectrum was comapred with the dialdehyde spectrum and aminobenzoic acids.